ORA-19197: Column not found or invalid column

admin

ORA-19197: Column notfound or invalid column type with this form of
fn:collection
Cause: The column to be retrieved was not found or was not ofXMLType.
Action: Thecolumn to be retrieved in the form of
fn:collection('oradb:/schema/table/ROW/column') or
fn:collection('oradb:/schema/table/ROW[predicate]/column') has to be of
XMLType.